PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
Engine Instrument and Crew Alerting System (EICAS)
5-18
CABIN PRESSURE AND AUXILIARY POWER UNIT (APU)
STATUS
Cabin pressurization and the APU status are displayed in the lower left
corner of the EICAS. The annunciations are described below.
D
Cabin Pressurization
-- Cabin climb/descent rate is displayed in
feet per minute (fpm). Cabin pressure differential is displayed in PSI.
Cabin altitude is displayed in feet. All displays are cyan. The
resolution of the cabin settings are as follows:
-
Climb/descent rate: 50 fpm
-
Pressure differential: 0.1 PSI
-
Altitude: 100 ft.
When cabin pressure differential exceeds its limits, the pressure
differential digits turn amber in an amber box or red in a red box.
When cabin altitude exceeds 8100 feet, the cabin altitude digits turn
amber in an amber box. WHen cabin altitude exceeds 10,000 feet,
the digits and box turn red.
The cabin altitude rate has a range of from --2000 feet per minute
(fpm) to +2000 fpm in 50--foot increments. It is displayed in green.
Cabin pressure differential (P
D
) ranges from --0.4 PSI
D
to + 10.00
PSI
D
. The colors of the digital display are described in table 5--14.
Value (PSI
D
)
Color
--0.5 to --0.4
Red
--0.3 to --0.1
Amber
0.0 to +7.9
Green
8.0 to 8.3
Amber
> 8.4
Red
Color Differential Pressure Display
Table 5--14
D
APU Status
-- The APU status consists of the APU turbine speed
and the APU exhaust temperature. The APU annunciation and
labels are white. The digits follow the logic given in tables 5--15 and
5--16 .
